This is what I've been buying lately:

Eley Black Box (competition use)
CCI Mini-Mags 40gr LRN
CCI CB Short 29gr LRN
Federal Auto Match (my favorite bulk ammo)


I've also got a few boxes of CCI Velocitor 40gr CPHP on hand, but after buying a .17 HMR I've pretty much stopped buying it. The .17 already does a much better job of feeding my need for a high velocity rimfire. It's an amazing little round.